APA Style
WordPerfect for Windows: Reference. (1991).
Washington:
WordPerfect Corporation.
Chicago Style
WordPerfect for Windows: Reference.
.
Washington:
WordPerfect Corporation,
1991.
Text.
MLA Style
WordPerfect for Windows: Reference.
.
Washington:
WordPerfect Corporation,
1991.
Text.
Turabian Style
WordPerfect for Windows: Reference.
Washington:
WordPerfect Corporation,
1991.
Print.